During the summer Calvin and his friends take a vacation to the 'Ten Flags' Playground. There, there are 10 roller coaster rides that "must" be tried. When it was night, Calvin and his friends could only try five of the 10 rides, because they were queuing up. There are 2 people who could ride the same two roller coasters. How many people came to the playground with Calvin that day?
Sun Jan 26 2020 12:20:47 GMT-0500 (EST)